3 years ago

Simplify: 21 ÷ 3 + 0.42 × 4 - 3.12

Mathematics

1 answer:

evablogger [386]3 years ago

3 0

The correct answer is 26.56.

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An experiment involves 17 participants. From these, a group of 3 participants is to be tested under a special condition. How man

lakkis [162]

Answer: 680

Step-by-step explanation:

When order doesn't matter,then the number of combinations of choosing r things out of n = $^nC_r=\dfrac{n!}{r!(n-r)!}$

Given: Total participants = 17

From these, a group of 3 participants is to be tested under a special condition.

Number of groups of 3 participants chosen = $^{17}C_3=\dfrac{17!}{3!(17-3)!}\$

$^{17}C_3=\dfrac{17!}{3!(17-3)!}\\\\=\dfrac{17\times16\times15\times14!}{3\times2\times14!}\\\\=680$

Hence, there are 680 groups of 3 participants can be chosen,.

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3 years ago

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Setler79 [48]

Answer:

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Step-by-step explanation:

l*w=a

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What is the absolute value of the complex number -4- sqrt 2i? A) sqrt 14 B) 3sqrt2 C)14 D)18

Novosadov [1.4K]

Remember the pythagorean theorem.

a^2 + b^2 = c^2

The complex number is a+bi, the absolute value is 'c'

$|-4-\sqrt{2} i| = \sqrt{(-4)^2 + (-\sqrt{2})^2} = \sqrt{16+2} = \sqrt{18} = 3\sqrt{2}$

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3 years ago

Can the absolute value of -4 be 1/4

kozerog [31]

no because the absolute value of 1/4 is 1/4 and the absolute value of -4 is 4

absolute value is just a positive version of the number inside of the symbol

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Your answer would be A. x $\leq$ 2

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